src/uploader/main.go | 2 +-

diff --git a/src/uploader/main.go b/src/uploader/main.go
index 116c4025a95f166b52da6ab1ecb9744dc6367e70..0416fdfc9d12c79f92e2e733f484c3d77f404a8c 100644
--- a/src/uploader/main.go
+++ b/src/uploader/main.go
@@ -114,7 +114,7 @@ 	if p.FormName() != FileFieldName {
 		log.Println(r.RemoteAddr, "non file form field")
 		return
 	}
-	h, err := blake2b.New256(nil)
+	h, err := blake2b.New512(nil)
 	if err != nil {
 		panic(err)
 	}